Samsung Galaxy S21 Ultra Zoom Lens. I have been a serious photographer for many years. I have always favored zoom lenses, because they permitted crisp images from near to far without having to get too close to my subjects. I love nature photography, and most of the animals and birds I shoot are either too far away, or behind barriers in zoological parks. Twisting the barrel of a medium zoom lens can bring family, friends, animals and birds right up to the camera, and they remain oblivious to my presence. In the SLR world, a 24 to 200 mm lens is considered a medium zoom. Not really long, but adequate for most situations. The problem with SLRs, even modern digital cameras, is that they are bulky. A 200 mm zoom can be small and light; but, it still must be a few inches out from the camera. I love the fact that my Smartphones are always in my pocket. It is said that the best camera is the one in your hand, and I have longed for a Smartphone that had on optical zoom that didn't require the attachment of an accessory lens. They never have worked very well anyway. So, although I am perfectly happy with my Galaxy Note 10+, its lack of an optical zoom longer than 2X makes it unsuitable for anything but up close shots. You can do a creditable job with scenes, and groups; but, getting up close to a bird 100 yards away...not. The S21 has a 10x optical zoom, and the camera lens is only a quarter of an inch bump on the back of the camera. I have no idea how they did it, but this is like putting a 200 mm lens on the phone. Eureka! I will still stick with my 600 mm zoom on my Canon 6t digital camera; but, every waking moment will find this beautiful phone in my hand. If you are interested in photography with your phone, this is a no brainer. 